Improvement in head-block for saw-mills



tltttrtl what j JOHN n. Buscar, or FINDLAY, AND GEORGE Bunker. orBLIFFTON,

t. OHIO.

Letters Patent No. 99,838,

dated 'February l5, 1870.

The Schedule referred to in these Letters'Patent and making part:` ofthe same.

To all 'whom ttt may concern Y Be it known that we, JOHN H. BURKE, ofFindlay, in the county of Hancock, and GnonenBUnKEr, ofluiiton, in thecounty of Allen, and State of Ohio, have invented a new and improvedHead-Block for b'aw-'lills; and we do hereby declare that thefollowingis a full, clear, and exact description of the construction andoperation of the same, reference being had to the accompanying drawingsmaking a part of this specification, in which Figure 1 is a top viewFigure 2 is a side elevation ;Y

Figure 3 is an end view;

Figure 4 is an under side view in detail of knees ofv head-block,showing arrangement of clamps and pawl.

Figure 5 is also a view in detail, showing particularly the manner ofattaching rod to rack.

Like letters in the figures ofthe drawings indicate like parts. i

Our invention has reference to so construct-ing the head-block as thatthe knee thereof may beset either by hand or by power; and

It cousists- First, of a weighted lever attached to a rod passingthrough near the end of the head-block, said rod connectingwith the rackby crank-levers in combination with the knee, having clamps so arrangedon its under side with the rack and so connecting with a weighted leverabove as that the clamps willhe caused by the weight thereof to pressagainst the sides of the rack, so that as the latter' is moved the knee-will be moved also, and thus set tothe sawing of thick vor thin lumber,as may be required, the log being properly fastened to the knee, thesaid knee heilig properly regulated by pawls engaging with teeth on. theside of head-block so that it cannot bc drawn back by the mot-ion ofIthe rack, and having a lever and pawl so connected and arranged withthe. teeth of the rack as that the knee may be moved by the lever to Setone end ofthe log ahead of the other without moving the rack.

Second, of an inclined plate att-ached to the door or base on whichthehead-block is constructed, in combination with the weighted leverattached to the rod as above mentioned, so that, by a series of holes inthe side of the head-block, or in a plate attached thereto, next to theend thereof, and a piu inserted in the proper hole, .the weighted levermay be regulated by the pin so that the lever will be carrie-d againstthe incline of the plate by the movement of the headblock sothat it willbe raised as if. by hand, and thus operate the rack and set the knee forsawing thick or thin lumber, as may be required.

We construct our invention as'follows:

the proper manner'to the sliding track B.v

C is the weighted lever, having a forked end with a holethcrein fittingover the rod D, and held thereto h v a set-screw, a, or otherwise. Thisrod passes through the head-block near the rear endrthereotand through aslot in the rack E, which slot is of suiicient size to allow the rack tomove free ofthe rod.

The rack EA is connected with the rod by the cranklevers b b bbeingrigidly attached to the rod and then by a pivot to lever b, which ispivoted to the side of the rack, so that every time the rod is turnedbythe lever C, the rack will be caused to move, the rackbeing properly'arranged to slide or move in the end piecesvof the -head-block.

F is theiknee, having tongued sides lttingsutliciently loose in thegrooved sides ofthe head-block as to admit of its being freely movedtherein, and provided on its undery side with clamps c e, arranged oueach side of the rack and pivoted to the knee, and so connecting withthe weighted lever d above as that the weight thereof will keep Atheclamps pressed against the sides of the rack; thus, as the rack is movedby the lever C, the pressure of the clamps will become tightenedthereon, and the knee will be necessarily carried forward so that it maybe set to any required thickness of lumber to be sawed.

To prevent the knee from being drawn back by the movement of the rack, apawl, e, with spring and pin, is arranged on the under side of knee, toengage with teeth on the `side of the head-block. This pawl is connectedwith the lever d by a stout cord or chain,

f, so that to draw the knee back the lever must be raised, which willrelease the pawl as well as' the clamps.

To move the knee without moving the rack, so as to carry one end of thelog aheadof the other, a lever,

G, is pivoted to the rear end of the knee, having a pawl, g, which,engaging with the teeth of the rack,

serves as a fulcrum for the lever to act upon irrimpellihg the kneeforward.

H is the inclined plate hinged in al suitable manner to the 'floor h onwhich the track is constructed.

I is an upright plate attached to the side ofthe head-block next to theend thereof, and having a projection, t, at the-- bottom of it, on whichthe fork of lever C rest-s. This plate is provided with one or .moreholes, and a pin, k, to be inserted in the proper hole for regulatingthe action of the lever C on the rack in setting the knee.

lUur invention isloperated as follows:

The knee sets or adjusts the log, which is properly fastened to it, tothe desired thickness of lumber to be sawetl by raising the lever C tothe propcheghgw which causes the rod, by means of the crank-levers, toimp`el the rack forward, the motion of which 'causes the clamps o c toembrace either side of the rack tightly, and hence movel and set theknee. To set the knee hy power, this is accomplished by raising theinclinedplate H to can upright position, which, when operating theleverfG'by hand, is laid down on the floor. This plate raises the leverto the proper height by the motion of the head-block, which causes thefork ofthe lever to strike the loweredge of the incline and ascendthereon until it is raised up to the horizontal projection of theincline, when the fork of the lever leaves it, and the plate is thenturned to one side or laid down on thel Hoor, so as to be out of the Wayon the return motion of the head-block. The distance `the lever is thusraised of course depends'upon the angle of inclination and the extent ofit between the upperand lower edges of plate, but whatever it is, the

knee will be moved a distance corresponding with that made by lever,estimated vertically between two parallel lines drawn horizontally fromthe upper and lower points of the incline.

Now, to set or gauge the knee to the thickness desired, the holes in theplate I will give this, which will be so arranged that 'by placing thepin 7c in a certain hole a certain thickness will be given thuf, byinserting the pin in a hole above the projection 'i and underthe fork ofthe\lever C, the fork resting on the pin, the lever will strike abovethe lower edge of the incline, and by removing pin and placing it in ahole still higher np, lever wil1\strike further above on the incline,and so on, so that the distance which the lever is raised or lowered maybe so regulated by the pin as that the knee may be set tothe sawing ofthick or thin lumber, as may be required.

Having thuslfully described my invention,

What I claim therein as new, and desire to secure by Letters Patent, is-

1. The knee F provided with the weighted lever d,

Witnesses:

CHARLES S. BANN, J Aeon. F. BURKET.

